Big Boss Cummins ISX Exhaust Manifold (NON-EGR)
Easy 30-Day Returns
You have 30 days from delivery to request a return, with no restocking fees. Return shipping is the customer's responsibility. All sale items are final sale.
DESCRIPTION
Available for: 1999-2002 Non-Egr ISX Cummins Engines
Key Benefits
- 20% increase in airflow over stock
- 75-100 degree cooling of EGTs
- Made in the USA
Warranty: 2 Year Unlimited Mile Warranty
We have designed our exhaust manifolds to maximize the exhaust air flow to reduce turbo lag time and cool exhaust temperatures. In the design of the manifold each port is analyzed and tested to provide a balanced flow to the turbocharger. Big Boss Exhaust Manifolds produce, on average, a 20% air flow increase over a stock manifold, cooling exhaust temperatures by 75-100 degrees. PDI manifolds are a big part in maintaining the best exhaust pressure to boost pressure ratios which will provide potential for increased fuel economy.
At PDI, we use only the best material for our products. We use a superior grade of High Silicon with Molybdenum Ductile Iron (HSMD) that eliminates weak points such as warping, cracking, and center divider failure from heat erosion. This material, combined with a redesign of the mounting surfaces, eliminates common failures due to a fatigued manifold.
NOT LEGAL FOR SALE OR USE IN CALIFORNIA
* Required Turbo - 715500
*Ships Directly from PDI*
Shipping information
All in-stock orders ship via UPS Ground. Orders placed before 3:00 PM CST, Monday through Friday, ship the same business day — because downtime costs you money and every hour counts when a truck is down.
Orders placed after 3:00 PM CST, on weekends, or on holidays ship the next business day. As soon as your order leaves our dock you'll receive tracking so you can follow it every mile of the way. Larger or heavier items may ship by freight — if that applies to your order, our team will reach out with the best options.
Have a rush order or a question about delivery? Give us a call and we'll do everything we can to get your parts to you fast.
Returns & warranty
30-Day Returns. Ordered the wrong part or changed your mind? You have 30 days from the delivery date to request a return. Items must be new, unused, and in their original packaging. Some items — such as electrical components and special-order parts — may not be eligible for return, so reach out if you're unsure and we'll be glad to help.
Warranty. We stand behind everything we sell. All parts are covered by the manufacturer's warranty against defects in materials and workmanship. If a part arrives damaged or fails due to a manufacturing defect, contact us and we'll make it right — quickly and hassle-free.
To start a return or a warranty claim, just contact our team with your order number and we'll walk you through the process. We've built our reputation on keeping trucks moving and treating every customer the way we'd want to be treated.
